Bring science to life with fun and imaginative toys from Koontz.
Build a combination lock mechanism from strong, easy-to-assemble, precut durable and recyclable cardboard parts and explore how it works.
Instruction leaflet explains the secret behind the solution to this ancient puzzle and suggests ideas to test the lock on friends and family.
Dimensions: 15cm (w) x 23 cm (h) x 3 cm (d)
Ages: 8 Years and up.